Investigators worked through the night to determine what led a truck driver to plow down people on a riverfront bike path near the World Trade Center, brandishing air guns and yelling “God is great” in Arabic as his deadly route of terror ended with a crash, authorities said.

Eight people were killed and 11 seriously injured in a Halloween afternoon attack that the mayor called “a particularly cowardly act of terror.” The driver — identified by officials as an immigrant from Uzbekistan — was in critical condition but expected to survive after a police officer shot him in the abdomen.

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A roughly two-mile stretch of highway in downtown Manhattan was shut down for the investigation. Authorities also converged on a New Jersey home and a van in a parking lot at a New Jersey Home Depot store. Authorities were scrutinizing a note found inside the attacker’s rented truck, according to two law enforcement officials who were not authorized to discuss the ongoing investigation and spoke on the condition of anonymity.

Warning: Some might be disturbed by the contents of this video

New York Gov. Andrew Cuomo said officials believe the suspect acted as a lone wolf and added that there is no evidence to suggest a wider plot or scheme.

Police and the FBI urged members of the public to give them any photos or video that could help. The attack echoed a strategy that the Islamic State group has been suggesting to its followers. While police didn’t specifically blame any group for the strike, President Donald Trump railed against the Islamic State and declared “enough!” and “NOT IN THE U.S.A.!”

We must not allow ISIS to return, or enter, our country after defeating them in the Middle East and elsewhere. Enough!

The victims reflected a city that is a melting pot and a magnet for visitors: One of the dead was from Belgium. Five were from Argentina and were celebrating the 30th anniversary of a school graduation, according to officials in those countries.

"The Argentine Government expresses its sincere condolences for the death of Argentine citizens Hernán Diego Mendoza, Diego Enrique Angelini, Alejandro Damián Pagnucco, Ariel Erlij and Hernán Ferruchi which occurred as a result of the dramatic terrorist attack in New York this afternoon," the ministry said in a statement.

The injured included students and staffers on a school bus that the driver rammed.

“This was an act of terror, and a particularly cowardly act of terror aimed at innocent civilians, aimed at people going about their lives who had no idea what was about to hit them,” said Mayor Bill de Blasio, a Democrat.

Officials who were not authorized to discuss the investigation and spoke on the condition of anonymity identified the slight, bearded attacker as Sayfullo Saipov, a 29-year-old who came to the U.S. legally in 2010. He has a Florida driver’s license but may have been staying in New Jersey, they said.

Records show Saipov was a commercial truck driver who formed a pair of businesses in Ohio. He had also driven for Uber, the ride-hailing company said. An Ohio marriage license shows that a truck driver with one of Saipov’s addresses and his name, spelled slightly differently, married a fellow Uzbek in 2013.

During his time in Fort Myers, Florida, several years ago, Saipov was “a very good person,” an acquaintance, Kobiljon Matkarov, told The New York Times.

“He liked the U.S. He seemed very lucky, and all the time, he was happy and talking like everything is OK. He did not seem like a terrorist, but I did not know him from the inside,” Matkarov said. He said Saipov later moved to New Jersey and began driving for Uber. San Francisco-based Uber said he started over six months ago.

Police said the attacker rented the truck at about 2 p.m. at a New Jersey Home Depot and then went into New York City, entering the bike path about an hour later and speeding toward the World Trade Center, the site of the deadliest terror attack in U.S. history.

He barreled along the bike path in the truck for the equivalent of about 14 blocks, or around eight-tenths of a mile, before slamming into a small yellow school bus.

“A person hopped out of the car with two guns and started yelling and screaming,” said a 12-year-old student who had just left a nearby school. “They were yelling ‘Allahu Akbar.’”

The student, whose mother asked that his name be withheld, said he ran back into the school, where students cried and huddled in a corner.

Video shot by bystanders showed Saipov walking through traffic wielding what looked like two handguns, but which police later said were a paintball gun and a pellet gun. A police officer shot Saipov when he wouldn’t drop the weapons, police said.

The mayhem set off panic in the neighborhood and left the pavement strewn with mangled bicycles and bodies that were soon covered with sheets.

“I saw a lot of blood over there. A lot of people on the ground,” said Chen Yi, an Uber driver.

The note inside the truck was handwritten in a foreign language, according to one of the two law enforcement officials who spoke about the document. Both said its contents were being investigated but supported the belief the act was terrorism.

Uzbekistan President Shavkat Mirziyoyev sent his condolences to the president and the families of the victims on Wednesday, and offered his country’s assistance in investigating the attack.

New York Gov. Andrew Cuomo, a Democrat, called Tuesday’s carnage a “lone wolf” attack and said there was no evidence to suggest it was part of a wider plot.

New York and other cities around the globe have been on high alert against attacks by extremists in vehicles. England, France and Germany have seen deadly vehicle attacks in the past year or so.